I can confirm Giles Weaver's note above - by typing correct password after receiving the "white screen of death", I am logged back into user A session.
-- switching to current logged in user freezes gdm https://bugs.launchpad.net/bugs/78470 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs